Incandescent electric lamp



C. H. McKAY.

INCANDESCENT ELECTRIC LAMP.

APPLICATION FILED 1AN.2. 1918.

1,305,295. Patented June 3,1919.

ME llllW 67a l wefiw,

7 97008 GJUQ/ CLARENCE H. MOKAY, OF READING, MASSACHUSETTS.

INCANDESCENT ELECTRIC LAMP.

' Specification of Letters ratent. Patented J n 3, 1919.

. Application filed January 2, 1918. Serial No. 209,901.

To all whom it may concern:

Be it known that I, CLARENCE H. Mc- Kay, a citizen of! the United States, residing at Reading, in the county of Middlesex. and State of Massachusetts, have invented new and useful Improvements in Incandescent Electric Lamps, of which the following isa specification.

This invention relates to incandescent lamps adapted particularly for use in connection with motion picture machines, to supply the light which passes through the usual film. The invention is embodied in an incandescent electric lamp comprising an incandescing member of thin sheet material having parallel sides, the filament presenting a solid incandescent surface of relatively large area, adapted to project light more eifectii'ely than the usual filaments of incandescing wire, and separately formed leading-in members adapted to overlap and exert clamping pressure on edge portions of the opposite sides of the incandescing memher, the latter being separable from the leading-in members and adapted to be readily renewed when it becomes inoperative. I

The invention is also embodied in means for conveniently adjusting a lamp provided with an incandescing member embodying the inventiomin such manner as to cause embodying the invention, showing one side the sides of the incandescing member to accurately face in any predetermined direction desired.

Of the accompanying drawings forming a part of this specification;-

Figure 1 is a side elevation of a lamp of the incandescing member.

Fig. 2 is a similar view of the lamp turned to show an edge view of a portion of the incandescing member and one of the leading-in members.

Fig. 3 is an enlargement of a portion of Fig. 1.

Fig. 4 is a section on line 44 of Fig. 3.

Fig. 5 is a view similar to Fig. 3, showing a modification.

ig. 6 is a section on l1ne 6 -6 of Fig. 5. Fig. 7 is a side view, showing the incandescing member provided with ears at opposite. edge portions, the leading-in members bemg shown by dotted lines.

, Fig. 8 is a side view of the lamp and a socket with which the lamp is engaged.

Fig. 9 is a sectional view of the socket shown by Fig. 8.

Fig. 10 is a plan view of the socket shown by Figs. 8 and 9. Q

Fig. 11 is a perspective view, showing a portion of the lamp, its socket and motion plcture machine jaws engaging the socket.

Fig. 12 is a perspective view illustrating a modification.

The same letters of reference indicate the same parts in all of the figures.

In the drawings, 12 represents an incandescing member constructed in accordance With my invention, said member being inclosed in the bulb 10 of an incandescent electric lamp, and composed of'thin sheet material which may be the metal tungsten. The sides of the member 12 are parallel with each other and are substantially flat. I prefer to employ sheet material the thickness of which is substantially equal to the diameter of the resistance wire ordinarily used for incandescing filaments.

The member 12 is preferably substantially circular, as shown by Figs. 1, 3, 7-, 8 and 11, although it may be otherwise formed, as indicated by Fig. 5, which represents a member 12 of substantially rectangular.

form. The opposite edge portions of the member '12 are engaged with leading-in members 13, which constitute the usual medium for conducting current to and from the incandescing member 12. The leadingin members 13- are formed separately from the member 12 and are engaged .with--oppo-- the grooves against the edge portions of the member 12, said sides being flexible and malleable, so that they are adapted to maintain clamping pressure on edge portions of the parallel sides of the member 12, This I Leoaees construction permits a burned out or broken member 12 to be removed and another substituted forit.

Topermit the member 12 to be expanded by heat without liability "of breaklng it between the leading-in members 13, I mpart a suitable curvature to the parallel sides of the member 12, as indicated by Fig. 4, this curvature being in the body of the member 12, and not in the ears on the o-p-poslte edge portions thereof. The same result maybe attained by providing transverse corruga-- tions 12 on the member 12, near th'eears or edge portions that are engaged by the members 13. Either form permits the member 12 to bend or buckle sidewise when expanded by heat without increasing the distance between its clamped edge portions, and therefore without tendency to force the members 13 outwardly in opposite directions.

An incandescing member 12- characterized as above stated, is particularly eifective as a membenof ,a lamp which sup-plies light to the film of a motion picture machine. It

is important that the member 12 be adjusted to properly face the lens of the motion picture machine, the practically flat sides of the member 12 being at right angles to the path of light toAth-e film. Topermit a suitably accurate rotative adjustment of the lamp, without causing an endwise or 1ongitudinal movement thereof, I provide the lamp with an externally smooth cylindrical base or neck 16, adapted to be rotated in an internally smooth cylindrical socket 17, so that the incandescing member 12 may be accu-rately adjusted by a turning movement of the lamp base in its socket, without moving the lamp base endwise, and therefore without interfering with the circuit connections through the base.

To secure the lamp at any adjustment to which it may be rotatively adjusted, I provide clamping means including the socket 17, and a clamping sleeve 19 embracing a portion of the socket. One end of the socket is closed, as indicated by Fig. 9, and the socket wall is provided with longitudinal slots 20 extending from its open end partly to the closed end, the portion of the socket containing said slots being therefore" compressible. The clamping sleeve 19 embraces the compressible portion of the socket and is provided with ears 22 which are connected by a headed bolt 23 having a clamping nut 24. WVhen a lamp base inserted in the socket is properly adjusted, it is secured at the desired adjustment by tightening the nut 24. The clamping sleeve 19 is supported on the compressible portion of the socket by means of ears 25 projecting outwardly from the lower portion of the socket, forming rests for the lower edge of the sleeve 19.

The closed end of the socket 17 includes a the lamp,

shank of smaller diameter than the socket,

the members of said shank being a sleeve 26 I of conducting metal secured as by rivets 27, to the socket, an insulating sleeve 28 of porcelain contained in the metal sleeve 26, and a rod or bolt 29 of conducting metal passing through the insulating sleeve 28 and having a head 30 constituting a contact terminal, and a wing nut 31 adapted to engage a conducting wire for clamping the same against a disk 32 of insulating material, such as mica, bearing on the outer ends of the sleeves 26 and 28.

The above described shank is adapted tobe clamped between jaws 33, 34, in a motion picture machine, said jaws forming parts of the circuit connections, and bearing on the conducting sleeve 26. The said shank and jaws constitute another embodiment of means for rotatively adjusting the lamp to cause its incandescing member 12 to face in a predetermined direction In each of the embodiments of the invention above described the plane of'the sides of the incandescing member 12 is vertical or parallel with the longitudinal axis of the lamp. Fig. 12 is intended to show the memer 12 arranged with its sides in a plane at right angles with the longitudinal axis of so that if said axis be'vertical, the plane of the sides of the member 12 will be horizontal. In this case the lamp base or neck may be screw-threaded for engagement with a screw-threaded socket, a longitudinal adjustment of the lamp caused by the operation of screwing it into a socket being immaterial.

I claim:

1. An incandescent electric lamp comprismg an incandescing member of thin sheet material having parallel sides, separately formed leading-in members adapted to support the incandescing member and formed to overlap and exert clamping pressure on edge portions of the opposite sides thereof, and a bulb inclosing said members.

An incandescent electric lamp comprising an incandescing member of thin sheet material having parallel sides, separately formed leading-in members adapted to support the incandescing member and having fiat-sided grooves receiving opposite edge portions of the incandescing member, the sides of sai grooves being flexible and adapted maintain clamping pressure on edge portions of the parallel sides of the incandescing member, and a bulb inolosing said members.

3. An incandescent electric lamp comprising an incandescing member material having parallel sides, separately formed leading-in members adapted to support the incandescing member and engaged with opposite edge portions thereof, the sides of said incandescing member being of thin sheet.

curved between said edge portions to permit the bending or buckling of said sides, and a bulb inelosing said members.

4. An incandescent electric lamp comprising a bulb having an externally smooth cylindrical neck, an incandescing member of thin sheetniziterinl having parallel sides, and leading-in members engaged with opposite edge portions of the ineandescing member. zaid neek bein adapted to be rot-atively engaged with u hxed holder to cause the sides of the ineundeseingr member to face in any desired direction.

In testimony whereof I have affixed my signature.

CLARENCE .H. i\IL-I AY., 

